It does not open in Acrobat or Reader... not sure what other programs you think I should try?

It's basically a bunch of lines and some text... the text is a Font that we use here at the MTO (FHWA)

This is the first time I've ever had this problem.

The weird thing is if I try to open the file in Illustrator by clicking "File", then "Open..." and then highlight the file in the "Open Dialog Window", I can see a preview of the file. But then when I finally click "open" in the dialog window, I get that error message?